https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101933
Bug ID: 101933
Summary: Unloaded dll with global std::mutex causes exe to
crash on exit #38
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mailnew4ster at gmail dot com
Target Milestone: ---
Reproduction on Windows:
Create and compile dll.cc as following:
```
#include <mutex>
std::mutex x;
```
g++.exe dll.cc -shared -o test.dll
Create and compile exe.cc as following:
```
#include <windows.h>
int main()
{
auto x = LoadLibrary("test.dll");
MessageBox(0,0,0,0);
FreeLibrary(x);
MessageBox(0,0,0,0);
return 0;
}
```
g++.exe exe.cc -o test.exe
Run test.exe and observe a crash after seeing both message boxes.
The crash happens in msvcrt.doexit, which tries to call a cleanup function
inside the dll which was already freed.
I'm using TDM-GCC, and I also reported the issue there:
https://github.com/jmeubank/tdm-gcc/issues/38
I'm not sure whether it's specific to TDM-GCC, it applies some patches on GCC,
but they are very small and I think they probably don't affect this issue.
